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ChangeLocaleAction.javaAPI DocExample3970Thu Aug 12 16:24:28 BST 2004com.oreilly.strutsckbk.ch12

ChangeLocaleAction

public final class ChangeLocaleAction extends org.apache.struts.action.Action
Implementation of Action that changes the user's
link(java.util.Locale
and forwards to a page, based on request level parameters that are set (language, country, ,variant, & page). Also changes the JSTL locale.

Fields Summary
private Log
log
Commons Logging instance.
Constructors Summary
Methods Summary
public org.apache.struts.action.ActionForwardexecute(org.apache.struts.action.ActionMapping mapping, org.apache.struts.action.ActionForm form, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)

Change the user's @link(java.util.Locale) based on @link(ActionForm) properties.

This Action looks for language and country properties on the given form, constructs an appropriate Locale object, and sets it as the Struts Locale for this user's session. Any ActionForm, including a @link(DynaActionForm), may be used.

If a page property is also provided, then after setting the Locale, control is forwarded to that URI path. Otherwise, control is forwarded to "success".

param
mapping The ActionMapping used to select this instance
param
form The optional ActionForm bean for this request (if any)
param
request The HTTP request we are processing
param
response The HTTP response we are creating
return
Action to forward to
exception
java.lang.Exception if an input/output error or servlet exception occurs


                                                                                                                                       
       
                  
                  
                  
      

    // Extract attributes we will need
    HttpSession session = request.getSession();
    Locale locale = getLocale(request);

    String language = null;
    String country = null;
    String variant = null;
    String page = null;

    try {
        language = (String) PropertyUtils.getSimpleProperty(form, "language");
        country = (String) PropertyUtils.getSimpleProperty(form, "country");
        variant = (String) PropertyUtils.getSimpleProperty(form, "variant");
        page = (String) PropertyUtils.getSimpleProperty(form, "page");
    } catch (Exception e) {
        log.error(e.getMessage(), e);
    }

    if ( (language != null && language.length() > 0) &&
         (country != null && country.length() > 0) &&
         (variant != null && variant.length() > 0) ) {
        locale = new java.util.Locale(language, country, variant);
    } else if ( (language != null && language.length() > 0) &&
                (country != null && country.length() > 0)) {
        locale = new java.util.Locale(language, country);
    } else if (language != null && language.length() > 0) {
        locale = new java.util.Locale(language, "");
    }

    // reset the Struts locale
    session.setAttribute(Globals.LOCALE_KEY, locale);
        
    // reset the JSTL locale
    Config.set(session, Config.FMT_LOCALE, locale);
        
    if (null==page || "".equals(page))
        return mapping.findForward("success");
    else
        return new ActionForward(page);